Different devices have different screen density (pixel size, dpi).
How to detect it in runtime for use in Dc methods?
You can get the screen size in pixels, but not the pixel size or density. You could probably calculate it using say the screen size in inches and the pixel width of the screen. 1.3 inches and 240x240 for example.
Thanks for your answer.
How can i get screen size in inches?
It's part of the specs for every device. See buy.garmin.com